set term eps
set output "exe6.eps"
set title "舍入误差：加法顺序的影响"
set xrange [1:11]
set yrange [-17:-10]
unset key
set xlabel "log_{10} N"
set ylabel "log_{10} | ( s_{up} - s_{down} )/s_{down} |"
plot "exe6.data" w l lw 3, "exe6.data" w p pt 7 ps 3
